Water-waste preventer



LAURENE DAVIS, OF NEW MALDEN, ENGLAND.

wA'rER-wAsTn- PnEv NTER.

Spee'ficatonoftters Patent..

Patented May 1 1, 1920.-

Applicati'on filed May 29, 1919. Serial No. 300335;

To ZZ whom it may coaccm Be it knownthat I, LAURENOE DAVIES, subject of the King of Great Britain, residing at 55 Kings avenue, New Malden, in the .county of Surrey England, have invented Another object is to arrange inatters sothat upon the opening ot this valve, the 'How of water to the discharge tends to maintain the valve in the open 'position and the pressure in the tank has only limited access to the space above the valve lior efl'ecting the subsequent closing of the latter. i

Another object is to provide tor the opening oi' the valve by relieving the pressure above the valve and permitting pressure applied beneath such valve to eft'eet the opening.

Yet another object is to provide a control device for the discharge valve whereby the latter cannot be nanually held in the open position, or mechanically fixed. therein, the control being exercisable only :tor starting the flesh and being thereafter inoperative until certain conditions are restored by the re-filling of the tank or cistern.

The accompanyi ng drawings forming part of this speciication, illustrate, by way ot example two different constructions comprising these iinprovements, but it is to be understood that the invention is not limited to these constructions as the same may be modified in various ways without departing from the essential features hereinafter described and set out in the claims. i V

Figure l of the drawings is a central Vertical section of one Construction of closed fiushing tank or water waste preventer embodying these improvements in which the discharge valve is mechanically operated.

Fi 2 is a transverse section on the line n I of Fig. 1.

Fig. 3 is a central vertical section of another Construction comprising a control clevice in the form of a valve adapted for relieving pressure above the discharge valve in order to permit the latter to open.

Fig. l is a plan of Fig. 3.

Fig. 5 is a plan view of a central chamber and valve seat seen in Fig. 3 the said chamber and seat being turned through about 45 43170111 the position shown in Fig.

Fig. 6 is a central vertical section on the .line VI-VI- of Fig. 5.

Fig. 7 is a side elevation otthe valve casing detached and as seen from 'the right hand side of Fig. 3.

Reterring to the Construction seen in Figs. land 2, a is a closed tank of suitable shape and capacity formed with an aperture 7) at the top and with an aperture b at the bottom. The aperture b is closed by a cover c which nay be bolted on, and this cover has a socket portion f on its lower side into which is screwed a length of tube g extending to the bottom ot the tank (a. The bottom aperture b is closed by bolting on a tlanged tubular casing h to the lower end of which is connected the discharge or flush pipe In the upper end of the casing h is -screwed a length ot tube Ic of smaller external diameter than the bore of the tube g. The tube ?c is disposed within the tube g and reaches nearly to' the top of the latter, while' the tube g has its lower end a little above the bottom of the tank a, or rather above the depressed portion of the bottom formed by the flange of the chamber h covering the aperture *19 The upper end 70 of the tube 70 forms a seating for a valve Z having the usnal winged guide stem l a Washer Z being interposed to give tight closing. The disk oi' the valve Z nearly fits within the bore of the tube g so as to act like a piston with a leakage between the periphery of the disk and the wall of the tube g The service pipe for filling the tank is connected at 'n and, natura'lly, the' rate of discharge of the tank must be greater than the rate of supply at m. The valve Z may meet a buffer device in opening, in order to prevent Shock.

The casing h is formed with a stufiing box LZ and with a hearing recess h for a spindle n a gland being scr'ewed into the stufling boX h to compress a packng 0 on the spindle n and thus make a water-tght joint at i the place where the spindle 'n emerges from the casing. The spindle a has an Operating lever p secured to its outer end, and a cam or arm Q Secured to it within the casing Yt. A rod 7 rests upon thelever Q and is guided centrally within the tube by guide arms er spiders s 8 fixed on the rod 7'. The upper end of the rod r nearly touches the valve Z inthe inoperative position of the'parts.

In operation, suppose the tank to be nearly filled, the pressure due to the supply at m acts. upon the top of the valve Z and holds the latter down on its seat. If the levcr 2 be depressed, the arin Q will rise and lift the rod r w-hich in turn lifts the valve Z. The pressure in the tank now forces the water up the tube g and over the upper end 76 of theitube k, the discharge ensung being due partly tothe pressure and partly to siphonic action, the tube g being the short legand the tube 76 the long leg of the siphon. The pressure or force of the water beneath the' valve Z maintains the latter in the open position so that it is unnecessary to hold down the lever p after the flushing has started. As soon as the lower end of the tube g is uncovered, or before that according to the weight or loading of the valve Z, the 'flUSlling Will` cease owing to the valve re-seating itself and the pressure rising in the space above the valve will. forcibly hold the latter down on its seat.

The packing 0 is not necessary seeing that, normally, there is no water or pressure in the discharge pipe and that the 'flow or". water is free while the siphon action is taking place.

In the modification seen in Figs. 3 to 7, the tank consists of a cylindrical body 1 Welded to a bottom disk 2 having a central perforation 3 in which is fitted the discharge'valve casing 4, a fiange 5 on the latte' being bolted to the bottom disk 2. An annular chamber 6 is formed just within the casing 4 by screwing into the latter a cylindrical partition 7. The partition 7 is tightly screwecl down so that its bottom edge, suitably beveled, seats against a fiared wall 8 which merges the cylindrical wall of the casing 4 into the spigot 9 for connecting with the discharge or flush pipe 10. The lower portion of the casing 4 is enlarged for the formation of the annular chamber 6 and a flange 11 is formed in the casing in which the partition 7 screwed. A central and concentric cup 12 is connected or 'formed in one with the partition 7, an annnla'r passage 13 being left between the cup and partition. Openings 14, Fig. 7, are termed in the lower and enlarged portion of the casing 4 for the passage of water from the tank into the annular chamber 6 and the partition 7 is connected with the cup 12 by several radial passages or tunnels 15 for the *passage of water from the annular chamben 6 tojsthe; cup 12. The discharge valve 16 is;` a' lift valve seating upon the upper concentric edges 17 and 18 of the cup 12 i top of the casing 4 is closed by a disk or cover 21, so that the space above the valve 16 is an inclosed chamber but a small bore is tormed in the casing 4 in any convenient position as :tor example at 22.

lVhen the `tank is connected with the service pipe at 37, it is filled with' water under pressure, the said water passing through' the opening-s 14 and filling the annular chanber 6, the radial passages 1.5 and the cup 12. The water also passes through the bore 22 and fills the space above the valve 16. As the upper surface of the valve 16 so exposed is greater than the area exposed to the pressure in the cup 12 it follows that the valve 16 is held down tightly on its seat. If'the pressure in the chamber above the valve 16 be relieved, then the pressure in the cup 12 becomes effective for lifting the valve 16 from its seat: and the discharge takes place from the cup 12 over the edge 17, through the passage 1.3 and so to the discharge pipe 10. As the tank is emptied quicker than it can be filled from the service pipe, a definite quantity for each fiushing can be provided fer, and after the discharge of this quantity, the valve 16 Will reseat itseli and as the tank becomes filled and the pressure rises, such pressure will be again effective for keeping the valve, 16 on its seat. course, will occur when the rush of water froni the cup 12 to the discharge has so 'ar The closing of the valve 16, of

JOO

diminished as to be unable to keep the valve 16 lifted.

For effecting the relief of the pressure in the chamber above the valve 16, a duet 23- casing 28.' Thelast-named is shown screwed direct to a nipple 29 Secured in the discharge valve fitting. s chambered or cupped and contains, a pis.- L ton 30 the ron or stem of which pro ects through a hole in the bottom of the cup; The admssion to. the cup abovethepisten 30 is by the way of a small bore or, cazpllary hole 31 'formed in\ the top of the valve The relief` valve 25:

25 or cover of the cup. A. push rod 32 slides in a stufling box 33 and guide soekets 3 1 and is formed with a cam-like projection 35 extending just beneath the stem of the pisten 30, so that when the rod 32 is pushed in, the cam 35 forces the pisten 30 upward.

In operation, the tank 1 being charged with water and the valve 16 held on its seat by the pressure as above described, and the valve 25 being held on its seat owing to the pressure in the duet 23, the press ng inward of the rod 32 causes the cam 35 to raise the piston 30. The rising of the piston 30 at first eXpels some of the water from the piston chamber through the small hole 31 but the pressure quickly rises in such piston chamber until the efective pressure acting upwardly on the valve 25 is greater than the effective pressure acting downwardly on such valve. The latter then opens, but the piston continues to rise relatively to its chamber either due to the continued raising by its cam of the pisten, or to the depression of the valve by the outfiow of the water or the weight of the valve 25. The small amount of water fiowing past the valve 25 passes away to the closet pan, or other place to be fiushed, and the eflect is to relieve the pressure above the discharge valve 16, so that the latter opens in the manner above described and the flushing discharge takes place. Upon releasing the push rod 32, the latter may be returned to the outward position by a spring 36 and the relief valve 25 re-seats itself but cannot be operated again until the pressure has been restablished for depressing the pisten 30 to the bottom of its cylinder or chamber, so as to bring its rod or stem within effective range of the cam 35. The flushing discharge having been started will continue without continued pressure on the rod 32, seeing that the discharge valve will not be re-seated until the full discharge has occurred as above set forth. i

It is to be understood that the invention is not limited to the constructions described, as it will be apparent to those tamiliar with apparatus of this nature that various modifications are possible without departing from the invention. For example, the particular mechanism for Operating the relief valve may be modified in various ways and such known equivalents as lever arms, and rotary cams may be substituted for the sliding cam 35. Also, it will be seen that the pressure active upon the valve 16 to close it may be the pressure due to the head of water in the tank, or that head plus the pressure of the supply due to the tank being closed against the atmosphere.

I claim 1. A water waste preventer comprisin a tank, concentric tubular parts at the ischarge orifice of said tank, a discharging pipe, a discharge 'valve normally closing communication between the central space inclosed by the inner tube and the annular space inclosed between the two tubes there being communication between the interior of the' tank and one of said spaces and between the dischargc pipe and the other of said spaces, said val ve being maintained on its seat by fluid pressure and, when lifted, being held oil' its seat by the force of the discharge, and means controlling the rising of said valve from its seat substantially as set forth.

2. A water waste preventer comprising a tank, concentric tubular parts at the dis charge orifice of said tank, a discharge valve normally closing communication between the central space inclosed by the inner tube and the annular space inclosed between the two tubes there being communication be tween the interior of the tank and one of said spaces and between the discharge and the other of said spaces, a chamber inclosing a space above said valve and having a restricted communication with the space in the interior of the tank, said valve being' maintained on its seat by fiuid pressure and, when lifted, being held off its seat by the force of the discharge, and means control ling the rising of said valve from its seat substantially as set forth.

3. A water waste preventer comprising a tank, an annular valve seating supported above the bottom of said tank and surrounding the discharge orifice of said tank, a sec ond seating sinilarly supported and surrounding a space in 'free communication with the water space of said tank, a discharge valve adapted to close on to said seatings, a valve chamber above said seating and having restricted communication With the water space of said tank, a duet leading from said chamberto the exterior of said tank, a pressure relief valve normally closing said duet, and means operative upon said relief valve to open it substantially as set forth.

42. 1& water waste preventer comprising a closed tank adapted for connection with a pressure supply, an annular valve seating supported above the bottom of said tank and surrounding the discharge orifice thereof, a second seating concentric with the first and similarly supported said second seating surrounding a space in free communication with the interier of said tank, a discharge valve adapted to close on to said seatings, a valve chamber above said seatings and having restricted communication with the interior of said tank, a duet leading from said chamber to the exterior of said tank, a self-closing valve in said duet and operative means adapted for opening said self-closing valve.

5. A water waste preventer comprising a.

closed tank adapted for connection with a pressure supply, an annular valve seating supported above the bottom of said tank and surrounding the discharge orifice thereof, a second seating concentric with the first and similarly supported said second seating surroundng a space in free communication with the interior of said tank, a discharge valve adapted to close on to said seatngs, a valve chamber inclosing said seatings and said valve and having restricted communication with the interior of said tank, a duet leading from said chamber to the exterior of said tank, a self-closing valve in said duet, operative means adapted for opening said self-closing valve, said operative means comprising an operative connection which is dependent upon normal pressure conditions ior its complete operativeness substantially as set `forth.

6. A water waste preventer comprising a tank with a discharge orifice in its bottom, e cylndrcal wall upstanding around said orifice, a chamber open at its upper end and supported within the space inclosed by said wall, a discharge valve adapted to seat itself upon the upper annular edges of said wall and said central chamber, a valve 'chamber inclosng said wall, valve and central chamber and having a restricted communication with the interior of said tank, clucts communicating between the interior of said tank and said central chamber, a duet leading from said valve chamber to the eXterior of said tank, a pressure relief valve on the lastnamed duet, and operative means 'or said pressure relief valve substantially as set forth.

7. A water waste preventer comprising in combination a partially balanced pressureclosed discharge valve, a duct and a relief valve adapted' to be operated to relieve through said duet the closing pressure on said discharge valve, a piston in said relief valve adapted to be depressed by thepressure in said duct, and manually operated means having a range for engagng said piston when the latter is depressed by the pressure substantially as set forth.

8. A water Waste preventer comprising in combination a partially balanced pressureclosed discharge valve, a duet and a relief valve adapted to be operated to relieve through said duet the closing pressure on said discharge valve, a piston chamber fol-med in said relief valve with a top cover having a capillary opening to said duet, a'

and an annular chamber around its bottom portion there being a restricted opening i'rom the exterior into said top chamber and an unrestricted opening into said annular' chamber an annular discharge passage encircled by said annular chamber, a central cup encircled by said passage, ducts communicating between said annular chamber and said central cup, a ductextending from the top chamber to the exterior of the fitting, and a valve. adapted to seat and close the openings of said annular passage and said cup substantially as set forth.

10. Discharge valve combination for a water waste preventer comprising a valve rasing having a valve chamber in its top portion and an annular chamber around its bottom portion there being a restricted opening from the exterior into said top chamber and an unrestricted opening into said annular chamber, an annular discharge passage encircled by said annular chamber, a central cup encircled by said passage, ducts comniunicating between said annul'ar chamber and said central cup, a relief duet extending from the top chamber to the exteror of the tting, a valve adapted to seat and close the openings of said annular ,passage and said cup, a self-seating valve normally closing said relief duct, a piston work-V ing in a chamber formed in said self-seating valve said chamber having a restricted opening into said relief duet and said piston having its stem projecting beyond the bottom of said valve and manually operated means adapted 'or operatively engaging said stem when so projected substantially as set forth. I

LAURENCE DAVIES. 

